Variation in neurovirulence of NWS influenza virus after repeated passages in different tissue culture systems. I. Derivation and neurotropic activity of NWS virus lines.
D000818:Animals; D046508:Culture Techniques; D004660:Encephalitis / Q000382:microbiology; D006385:Hemagglutination Inhibition Tests; D051379:Mice; D009975:Orthomyxoviridae / Q000472:pathogenicity*; D014774:Virulence; D014776:Virus Cultivation